here you go tokarevusa.com/tokarev-hammer-titan-plus-two-extension-black/

Hey Luis, I’ve got the tokarev myself, for these guns I prefer going with the manufacturers product, here’s the link
tokarevusa.com/tokarev-hammer-titan-plus-two-extension-black/
For guns like my 870 you can pick up about any aftermarket part and will directly fit but my tokarev, I’ve had the most luck out of original manufacturers parts.

Good afternoon to you!! Please see below link for more information on the extension tube for you tokarev hammer. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸
tokarevusa.com/tokarev-hammer-titan-plus-two-extension-black/

Looks like this is what you'll want.
https://tokarevusa.com/tokarev-hammer-titan-plus-two-extension-black/

Hi Luis and welcome. I would contact Tokarev USA Customer Service for a direct fit recommendation at (865) 604-6894 Customer Support is available Monday – Friday from 9:00am to 4:00pm Eastern Time. Cheers, stay safe and enjoy!

Sir Luis,
There isn't a readily available "direct-fit" extension tube specifically marketed for the Tokarev Titan 12 gauge. Your best options are to
Purchase a universal shotgun extension tube compatible with 12 gauge shotguns.
Consult Tokarev or a qualified gunsmith for an exact match. The Tokarev Titan 12 gauge typically uses a standard 12 gauge shotgun thread pattern, but the exact thread size and diameter can vary.
Most universal shotgun extension tubes are designed to fit standard 12 gauge shotguns with common thread sizes (e.g., Mossberg, Remington, or Mossberg-style 12 gauge threads).
Hope this helps bud, please take care and stay safe 🙏